I want the skull to move foward when the path of rotating asteroids is open. Currently I use pathfinding behavior. But it seems pathfinding only works when since the beginning there are no obstacles. So in this case, if the path is opening and closing, what should I do to make the skull moving?

Screenshot - 17_03_2015 , 9_56_08.png

Screenshot - 17_03_2015 , 9_55_44.png

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Calculate path, checks where all the solid objects are (those where it can not move) if your solid objects move around, after calculating path, then its effect is lost, as the solid objects would be out of place.